> On Dec 29, 2015, at 12:44 AM, Roland King <r...@rols.org> wrote: > > I have some NSSliders hooked up on my UI to text fields with formatters, all > set up with bindings so that the label shows the slider value. The sliders > are continuous, looks fine, nice feedback for whoever’s driving. > > However I want to capture, in the app, the value of the slider only at the > end when the mouse goes up, once. That value ends up being sent out over > bluetooth, and I really don’t want to send 100 float values a second, when > only the last one matters anyway. Probably just trying would cause bad things > to happen. > > I’m used to UIKit which has the alternate form of action handling method > which gives you the event, but AppKit doesn’t have that unfortunately. > > I can’t capture mouseDown and mouseUp because the control gets them > > I tried a NSEvent.addLocalMonitorForEventsMatchingMask() but that doesn’t > capture events inside tracking loops, so I get the mouse down, and that’s it, > the slider eats the rest, which doesn’t help. > > In the action handing code, which gets called all the time, I can call > NSEvent.pressedMouseButtons() and that does appear to work and let me find > the final value. I didn’t get great comfort from the documentation that this > is reliable however. > > I can subclass NSSlider or possibly NSSliderCell but that sounds like a whole > world of pain,
Actually it's easy. For very similar reasons I needed the same behavior - live update of the slider's temp value for UI elements, but only call the final setter when the user is done. I subclassed NSSlider's keyUp: and keyDown: to call super and then call my own delegate method "sliderDidEndUpdate:" _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
